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Where did u buy A metal triglide fastener (plastic only for dogs <15lbs) & 1.5" wide nylon?
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I would suggest the one by two, or half by to type welded wire like they use on professionally built rabbit cages
Aluminum sheeting might not give the dog enough air, I would highly recommend getting galvanized after welded wire-a heavy gauge, and make sure you trim it out with batten or quarter around so that no sharp edges hurt the dog